strange messages

Pavel Urban pavel.urban@ct.cz
Wed Aug 3 13:56:38 UTC 2005


Vernon Schryver wrote:
>>From: Pavel Urban 
> 
> 
> 
>>Aug  3 05:10:00 dcc1 dbclean[25406]: 1.3.3 cleaning dcc_db
> 
> 
> there should have been preceding messages from dccd saying why it started
> dbclean.  I suspect it was because of increase in the database size
> due to the bug in 1.3.12.

It was a cron job.

> 
> 
> 
>>Aug  3 05:10:23 dcc1 dccd[900]: short packet of 1 bytes from 127.0.0.1,53986
> 
> 
> do you have something that sends 1 byte packets to local sockets?
> 

Yes, it is a simple monitoring system. Just sends 1 byte UDP packet.

> 
> 
>>Aug  3 05:36:04 dcc1 dccd[900]: sendto(OK, client 1 at 
>>81.164.109.16,40286: Resource temporarily unavailable
>>Aug  3 05:39:39 dcc1 dccd[900]: sendto(OK, client 1 at 
>>24.16.115.230,37572: Resource temporarily unavailable
> 
> 
> that is not good.
> did the network system run out of mbufs or something?
> 

Err... how can I obtain such information on Linux?

> 
> 
>>Aug  3 05:43:52 dcc1 dccd[900]: 1.3.3 database /var/dcc/dcc_db reopened 
>>with 1018 MByte window
> 
> 
> 33 minutes is a long time for dbclean to run, but not unreasonable
> for a public DCC server.
> 
> 
>>Aug  3 05:43:52 dcc1 dccd[900]: "rejected ADMN FLOD CHECK request; 
>>timestamp off by 33 seconds" sent to client 1030 at 127.0.0.1,53985
>>Aug  3 05:43:52 dcc1 dbclean[25406]: ADMN FLOD CHECK: rejected ADMN FLOD 
>>CHECK request; timestamp off by 33 seconds
> 
> 
> are you using Linux?  That looks like a standard side effect of
> how Linux and the last versions of BSDI's BSD/OS that I used
> shuffle mmap() data between swap and the file system.
> 
> 

Yes, RedHat's ES 3.

> 
>>I've never seen such logs before. Should I be worried?
> 
> 
> I try to fix everything,
> but those messages don't look fatal.
> 
> 
> 
>>I'm also seeing regular messages about excessive requests these days...
> 
> 
> On a public DCC server, those can be stopped by " -R,,400" to DCCD_ARGS as in
>     DCCD_ARGS="-u100,1000 -R,,400"
> I do not know whether allowing 400 anonymous requests/second or up to
> 34 million/day is a good idea.  It is what I've been doing on
> z.dcc-servers.net
> 

Are there any suggestions/experiences from other public dcc servers' 
admins? Would you mind sharing? Thanks!


-- 
***********************************************************************
Pavel Urban (pavel.urban@ct.cz)
IOL system disaster
Internet OnLine, www.iol.cz (owned by Czech Telecom, www.ct.cz)
***********************************************************************
    Vegetables should not operate electronic equipment.
           Computer Stupidities, http://rinkworks.com/stupid/
***********************************************************************



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